Drier



j Hy sUHR' DRIER Oct. 22, 1935.y

originalFiled April 26, 193,0 2 sheets-sheet 1 Oct. 22, 1935.'

H. suHR 2,018,505

DRIER Original Filed April 26, 19730 2 sheets-sheet 2 l l l l f *mi Y Patented Oct. 22, 1935 En srAf-TES 2,018,505 i. Damm Herman.. Suhr, Milwaukee, Wis., assi'guor to Acme.

Sheet'Metal JWrks, Milwaukee, Wis., acorpora'- tion' of Wisconsin continuation of,n application serial No; 4.47.6'52, April26;1930; Thisapplication 0ctober9,.1931,

Seria1.N0..-567,954

6 claims. (Cl. 34-19) This invention relates :tori driersand;l inA general, an' object-ofthe invention isitorprovide at drier which-*is eiflcient.. economical and safein operationqande embodieda, simple-1 and closely organized structure Whichisnotonly durable'but also susceptible of'easy andrcomparatively inexpensive manufacture.V While-the device is capableof advantageouspuseras a1laundry.drier it is equally well capable of other ,usea and .applica- In. carrying out. thet present invention-,ffr the drienis so constructed -a-ndorganized that afan or similar.- meansf is" utilized. tov set` up -a- .partial vacuum in-:thewdrying chamber im such manner that the circulation or recireulationxoffheated air through the dryinggchamber isunderrtheiniluence-of this -partial-vacuum. Preferably also a pressure chamber.- or hcod.\togethenwith avent for the pressure chamberwand:azheaterequipped with4 atburner are so operatively relatedV toeach othervand, to.. the fan. andsvdrfying chamber that thefan buildsup aslightfpressurein the. pres;- sure.- chamberby delivering theretdthe. air. ex.- hausted from the drying. chamber vand the pres.-

25. sure-built vupfin thepressure.chamber is utilized to expel some of. the .-moistair toI the. atmosphere and someftolthe. burnenas well asto set upv a current of moist airlpast.. the heater, which latter mixes .withefresh airprojected intcthe heat-.-

30. er by theburner and isrrecirculatedthrough the drying chamber. Y

Another importanteatureof the invention refA sidesin so .,organizingthe drying chamber. with the heater,. fanand. vent. that in. the., event kthe 35. fan stopswhile` the heater continues. to function, the heat will bedissipatedtothe exterior through the vent and will not. be e-iective Y to. circulate or supply heated gases lto the dryingchamber. rIhis prevents. excessive Vheatingpf .thedrying.- chamber 40 andY burning orL scorching4A ofthearticlesbeing dried..A

The present applicationvis. a. continuationY of and av substitutefor my applicationA for.Laundry driers, led April'-26, 1930,;Seral No. 447,652.

45, Other objects and advantages reside. in certain novel features of the construction, arrangement and combination of'L parte which will be hereinafter morefully described and particularly pointed out vinthe appended'i claims, reference 50 being'had to the accompanying drawings, forminga-partzofl this specification, and in which:

Figure lisa;y front. elevation of adryingzcabinet constructed lin; accordance with'V the ,present invention;v Y

55 Figure-21s an end elevation;

Figure. isa' plansect'iontaken online 3'-3 of Figure 1.;y

Figure` 4; isa vertical .longitudinal section;4 Figure 5.,is avertical sectionthrough the circulatinghccd;v 5 Figure 6 isa fragmentary detail section through a portion of theeheatingunit; and`r Figure 7v is va-.Ltransyerse vsection taken, on line 1.-.1 of Figure 6. y

Referring tothe drawings, the numeral .I-'des- 10 ignates a vcabinettl:`1e.front of which isprovided with hinge doorsv 2f,.through..which `access is had to 4the drying.. chamber provided by the cabinet. Agsuitable-latch .3 serves toA releasably secure the doors in closed position. As, best shown in Figl5 ure 4, the cabinet. is providedwitha spaced inner wall` 4' alt-the top, bottom and"one side,4 this ,inner wall coacting. with the adjacent structure of the cabinet top rovideinlet ,andoutlet ducts through which air is. admitted tocand discharged from 20 the interiorI of the cabinet, theair passing. from the drying chamber or interior. of the cabinet into theoutlet duct. through perforations 4f in the top por-tionpf, the inner, wall. and passing from the inlet. duct tothe interior( of. the cabinet ,or drying chamber through similar. perforations? in .the bottom portion of the inner wall. Suitable horizontal .rods 5 maybe provided withinl the cabinet to support the articlesto beidried.

Securedtothe outsidepofthe endwall .of the cabinet, adjacent'.l the inner side wall,is avhood 6 in which-are mountedthe circulating andheating elements to be hereinafter described. As best shown in. FigurefLthe Aend wall of the cabinet is providedwith a `circular opening 1 which com- 35 municates withthe hood .adjacentits upper end, while the lower end; of the hood communicates with ythe space formed' between the bottom of the cabinet., andthe bottom inner walll A Ypartitionf isprovided-.betweenthe lower. portion of 40 theinner side wallJl and. the. adjacent portion of the outer end wall of` thecabinet..

A suction fan 9`is .positioned within the hood 6 adjacent the inlet opening -1 .and isdrivenby an electric motor I0 mountedupona` bracket II secured to theside: of the hood Ii.A f

Afsuitable heater is providedwithin the lower portionfof thehoodl andmay comprise a trough I3 preferably formedfof` sheet metal and coacting 50 with end frames I 4 and I5 secured.. thereto by threadedzrods I6.to define acombustion chamber I2.

As best shown in Figures 5.and 6, the end frames vI4 andfl are securedto the. sides ofthe hood by 55y Ylated through the hood 6,

I9 extend downwardly over the sides of the trough I3 and are spaced therefrom to cause heat from the combustion chamber to be deflected down-l wardly in the direction oftravel of the=air circu- Heat for the combustion chamber I2 is'supplied by means of a gas burner 20, which terminates in a nozzle 2I'carriedby ra hollow bracket 22 secured to one of the endl walls of the hood 6.

As best shown in Figure '7 the upper end of the bracket 22 is open and communicates 'with the interior ofthe hood 6, while the lower end of the bracket is provided with an oriilce 23 surrounding theV burner nozzle 2|. Thus, as the iiame from the'nozzle is projected intothe combustion cham-` ber I2 through an opening I8 in one of the annular extensions I8, the same will actas an injector to draw outsideair into the combustion chamber.

The hood 6 on the pressure side of the fan 9r and preferably in its upper portion is provided with a vent Yto the atmosphere. In the particular constructionillustrated this. vent consists of va conduit 24 communicating at Yits lower end with one. of the. upper corners of the hood kI5, then extending within the drier between the. outer shell I and a portion of the inner wall 4 and having its upper end opening to the atmosphere.

When` the drier is in operation, the suction fan S-draws air from the upper end of the drying chamberjor cabinet and thereby sets up a partial vacuum in the drying chamber or cabinet. The airV drawn in this manner from the .cabinet or drying. chamber is delivered into the interior` of the hood and raises the pressure therein somewhat. It will thus beunderstood that the upper portion at leastof the hood 6provldes a pressure chamber.

VThe pressure thusv set up Vin the interior of. the hood causes a discharge of some of the moist air through the vent or conduit 24 to thev outside, Vcauses other portions of the moist air to owwith effective velocity throughthe hollow bracket or conduit 22 tothe burner atwhich itcommingles with the fuel lto form a combustible moisture VVwhichissues as a jet or ame from the nozzle 2I. The flame projects into Vthe heater :through Y the opening I8 and, as indicated, carries with it some of the outside air which passes up through the heater and then` downwardly through the hood `where it mixes with the current of air also set up by the pressure in the hood 6 and by the influence of the partial vacuum set upv bythe fan in the drying chamber. The current, of air flowing down through the hoodvand around the heater passes through the'inlet ductand through the perforations 4 in the bottom portion of theinner wall 4 into the drying chamber.

' Inasmuch as the airisV circulated with considerable rapidity, the same would have a tendency to travel and bank up at one side of the cabinet opposite the point of introduction. Therefore to'insure an even circulation of air throughout all parts of the drying compartment, a baille plate 25 is secured to the bottom of the inner perforated wall 4, and serves to trap and Vdeiiect a portion of air through that side of the ,drying compartment adjacent the point of discharge of the,V drying' chamber.

Vhad without dependence upon the operation of mains active the products of combustion and the heat generated will be dissipated through the vent 24 and will Vnot i'lndtheh way into the interior This desirable action is controls, electric Vor otherwise. The static structure withoutI movement of any kind has this in- Vheren't safety feature in it.

The other important advantages of the inventionlare the circulation of the heated air under the influence of the partial vacuumset up in the drying chamber and the utilization of the pressure built up inv the hood or pressure chamber to accomplish two purposes, one being the discharge of some portion of the moist air to the outside or exterior and the other the supply of moist heated air to the burner.

4 Still another advantage resides in the utilization of the burner to aid in supplying fresh heated air to the drier.

While one particular construction has been se- 3`0` lected andvshown for the sake of example or illustration, obviously Yvarious changes in the size, shape and arrangement of the parts can be made without departing from the spirit ofthe invention or the scope of the subjoined c1aims. 35

'Ihe invention claimed is:

1. A laundry drierv comprising a cabinet, a spaced inner wall-,for the top, bottom, and onel s ide of said cabinet, the top and bottom of said inner wall being perforated, a hood carried Von 40' oneV side of said cabinetand provided with an inlet and outlet communicating with the interior of said cabinet and having a fresh air inlet and an outlet to atmosphere, a heater mounted .with- I in said hood in alinement with `said fresh air in,-

2. A laundry drier comprising a cabinet, a

spaced inner wall for the top, bottom and one side of said cabinet, the top and bottom of said inner wall being perforated, a hood carriedon one side of said cabinet and provided with Yan inlet and an outlet communicating with the interior of said cabinet, and having afresh airinlet and an outlet to atmosphere, means mounted within said, hoody for circulating rair from said vcabinet through said hood, a Vheater mounted in said hood in alinement with said fresh air opening, and a burnerfor projecting a flame into said heater through said fresh air opening, and means for supplying heated air from said hoodinto said heater through said fresh air inlet. i

Y 3. A laundry drier comprising a cabinet, a spaced inner wall for the top, bottom and one Side of said cabinet, the top and bottom of said innerwallbeing perforated, a partition extendingv from the said oneside of said cabinet to the flower portion of the inner -side wall, a

.hood carried by said cabinet, air communication ed within said hood in alinement with said fresh air inlet, a burner positio-ned at the outside of said hood for projecting a ilame into said heater, and means mounted within said hood for circulating air from said cabinet through the inlet and outlet in said hood.

4. A laundry drier comprising a cabinet, a spaced inner wall for the top, bottom and one side of said cabinet, the top and bottom of said inner wall being perforated, a partition extending from the lofwer portion of the inner side wall to said cabinet, a hood carried by said cabinet, air communication openings between said hood and the space on both sides of said partition defined by said inner wall and the top, bottom and one side of said cabinet, a heater mounted within said hood, means for circulating air from said cabinet through said hood, and a baie plate positioned between the bottom perforated inner wall and the bottom of the cabinet to deect circulated air through a portion of said perforated bottom.

5. In a drier, a drying chamber, a heating chamber connected by outlet and inlet ducts to said drying chamber, a heating element having a fresh air inlet in said heating chamber, air moving means exhausting air from said drying chamber and discharging into said heating chamber whereby a re-circulation oi heated air is passed through said drying chamber and said heating chamber, a by-pass conducting heated air from 5 said heating chamber into said heating element through said fresh air inlet, and means for supplying heat to said element.

6. A laundry drier comprising a cabinet, said cabinet having spaced inner top and bottom walls, said walls defining with said cabinet separate upper and lower chambers, openings in said cabinet communicating with the outside thereof and with said chambers, and a hood detachably secured to the outside of said cabinet and including within its confines said openings, said hood being provided with means to exhaust air from one of said chambers into said hood and to discharge heated air from said hood into the other of said chambers, said chambers having openings communicating with the interior o! said cabinet whereby air passes from one chamber into the interior of said cabinet and hence into the other chamber.

. HERMAN SUHR.

CERTIFICATE OF CORRECTON.

Patent No. 2,018,505. October 22, 1935.

HERMAN SUHR.

lt is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line 75, claimy 3, after "side" insert the words and syllable of said cabinet, said hood having a fresh air inlet and an outlet to atmosphere, a heater mount; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 10th day of December, A. D. 1935.

Leslie razer (Seal) Acting Commissioner of Patents. 

